Loading patent…
AssigneeSharp Kabushiki Kaisha
InventorsAkira Ariyoshi, Hisayuki Shinohara, Katsushige Masui, Tetsuo Ueyama
Estimating the term…
First, second semiconductor lasers and a photodetector are integrated in a laser package of an integrated laser unit. A composite PBS is so structured that generally 100% of s-polarized light derived from the first semiconductor laser is reflected while generally 100% of s-polarized light derived from the second semiconductor laser is transmitted. Then, return beams of s-polarized light of the first, second semiconductor lasers separated by the composite PBS 18 are converged on the same photodetector by the first, second polarization hologram devices. By doing so, the first, second polarization hologram devices are adjusted independently of each other, so that the offset adjustment of servo error signals for the first, second semiconductor lasers can be easily achieved in assembly process. Thus, the optical pickup becomes easy to assemble and adjust.
An optical pickup having a first light source for generating an optical beam of a first wavelength, a second light source for generating an optical beam of a second wavelength different from the first wavelength, an optical system for converging the optical beams derived from the two light sources onto an optical disk, and a photodetector for detecting reflected light derived from the optical disk, the optical pickup further comprising:
Dependencies are inferred from the claim text.